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51 lines
1.4 KiB
51 lines
1.4 KiB
2 years ago
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#!/bin/sh
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# current_input_lines: a cantrip to count the number of lines used by the user's
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# current input in the terminal, taking into account wrapped lines and the length
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# of the terminal prompt.
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#
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# Cast this spell to measure the number of lines taken up vertically by the user's
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# current input in the terminal, even if the input is wrapped to multiple lines or
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# the terminal prompt is longer than usual.
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#
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# Usage:
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# current_input_lines
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#
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# Returns:
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# The number of lines used by the user's current input.
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#!/bin/sh
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current_input_lines() {
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# Save the current cursor position
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printf '\033[s'
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# Measure the width of the terminal
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terminal_width=$(fathom-terminal -w)
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# Measure the length of the terminal prompt
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prompt_length=$(echo -n "$PS1" | wc -c)
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# Calculate the number of columns available for the user's input
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available_columns=$(( terminal_width - prompt_length ))
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# Calculate the number of lines used by the user's input
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lines=$(( terminal_width / available_columns ))
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# If the input does not fit evenly into the available columns, add an extra line
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if [ "$(( terminal_width % available_columns ))" -ne 0 ]; then
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lines=$(( lines + 1 ))
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fi
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# Restore the cursor position
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printf '\033[u'
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echo "$lines"
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}
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# Check if the script is being executed or sourced
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if [ "$0" = "$BASH_SOURCE" ]; then
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# Script is being executed
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# Call the current_input_lines function
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current_input_lines
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fi
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